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"A lot of it happened when he became good friends with [HIM singer] Ville Valo."

"Ville drank a lot...He's the loveliest man ever, but he never ate. He just drank. I think Bam started sipping on a beer because he liked the way he looked."

"We would go out to dinner and he would immediately excuse himseld and go to the bathroom," April added. "I'd say, 'Are you throwing up?' And he says, 'Yeah, yeah. Sometimes I throw up and that way I'm not gonna get fat."

Bam, who now is now sober and lives in Spain with his pregnant wife Nicole Boyd, said despite not drinking until "maybe 24 or 25," "the rock star life and drinking spun out of control."

April also revealed how Bam's struggles with bulimia and drinking had lasting impacts. "It really hurts me when people make comments. 'You look like you gained some weight there.' I don't respond but I feel like saying, 'He was drinking alcohol and he was bulimic. And that's why he was thin.'"

If you, or someone you know, is suffering from an eating disorder please contact The Butterfly Foundation (1800 33 4673) for support.

20 Celebs Who Have Spoken Out About Their Struggles With Anxiety & Depression

20 Celebs Who Have Spoken Out About Their Struggles With Anxiety & Depression

Emma Stone: "The first time I had a panic attack I was sitting in my friend's house, and I thought the house was burning down...For the next three years it just would not stop."

1 of 20

Jennifer Lawrence: "[My mother] always told me that there was like a light in me, a spark that inspired me constantly...It was never known what it was, a kind of social anxiety."

2 of 20

Beyoncé: "It was beginning to get fuzzy...I would sit there at ceremonies and they would give me an award and I was just thinking about the next performance."

3 of 20

Taylor Swift: "And it can feel, at times, if you let your anxiety get the better of you, like everybody's waiting for you to mess up - and then you'll be done."

4 of 20

Lena Dunham: "To those struggling with anxiety, OCD, depression: I know it's mad annoying when people tell you to exercise...I'm glad I did. It ain't about the add, it's about the brain."

5 of 20

Adele: "I have anxiety attacks, constant panicking on stage, my heart feels like it's going to explode because I never feel like I'm going to deliver, ever."

6 of 20

Amanda Seyfried: "I still do get terribly nervous, and I think that's partly due to the fact I think too much and overanalyse things."

7 of 20

Kristen Stewart: "Between ages 15 and 20...I was constantly anxious. I was kind of a control freak. If I didn't know how something was going to turn out, I would make myself ill, or just be locked up or inhibited in a way that was really debilitating."

Ellie Goulding: "...Sick, horrible things would go through my mind but I didn't want to draw attention to myself...It got to the point when I couldn't even get into the car and go to the studio."

10 of 20

Dakota Johnson: "Sometimes I panic to the point where I don't know what I'm thinking or doing. I have a full anxiety attack."

11 of 20

Selena Gomez: "It just causes a lot of anxiety. There were a few months where I was a little depressed, where I wouldn't leave [the house] as much. I think I drove myself crazy for a little bit."

12 of 20

Kylie Jenner: "When I am not working, I get anxiety...I'm not a shy person and when I was younger I was crazy, and I feel like growing up in the spotlight, it just made me a more introverted person."

13 of 20

Zayn Malik: "My anxiety that has haunted me throughout the last few months around live performances has gotten the better of me."

14 of 20

Kristen Bell: "I felt plagued with a negative attitude and a sense that I was permanently in the shade. I'm normally such a bubbly, positive person, and all of a sudden I stopped feeling like myself."

15 of 20

Justin Bieber: "I always feel mentally and emotionally exhausted to the point of depression...The pressure of meeting people's expectations of what I'm supposed to be is so much for me to handle and a lot on my shoulders."

16 of 20

Cara Delevingne: "I think I pushed myself so far [at school] that I got to the point where I had a mental breakdown...I was completely suicidal, I didn't want to live anymore...I also realised how lucky I was, and what wonderful family and friends I had."

17 of 20

Lady Gaga: "I've suffered through depression and anxiety my entire life, I still suffer with it every single day. I just want these kids to know that that depth that they feel as human beings is normal."

18 of 20

John Mayer: "I would get anxiety attacks too, and we would talk each other down. It was heart palpitations, shortness of breath, coldness and shivers, strange stuff..."

19 of 20

Chris Evans: "I think most of our lives the root of suffering is listening to that brain noise.. it probably doesn't have much to say that's going to help you. All the time I've spent suffering as a result of brain noise, hours of my life wasted."